Non-coding RNA Coupling for CHO Cell Selection
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Solution Overview
Problem
Current methods for increasing recombinant protein yields in CHO cells are limited by metabolic burden and decoupling of marker production from Gene of Interest (GOI) production, leading to inefficient cell selection and productivity.
Innovation Solution
The use of non-coding RNAs, such as miRNA and siRNA, to promote or inhibit the production of selection proteins, closely coupling GOI production with marker production, thereby reducing metabolic burden and improving selection efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional antibiotic resistance markers are used for cell selection, then cell selection can be achieved, but metabolic burden increases and selection efficiency decreases due to decoupling of marker production from GOI production
Solution Approach 1:
The patent merges the selection marker function with the GOI expression by using non-coding RNAs that are transcribed together with the GOI. The non-coding RNA sequences are integrated into the same transcriptional unit as the GOI, ensuring that marker production is coupled to GOI production. This eliminates the metabolic burden of independently expressed antibiotic resistance genes while maintaining selection capability.
Solution Approach 2:
The patent extracts the selection marker function from traditional protein-based antibiotic resistance genes and relocates it to non-coding RNA sequences. These non-coding RNAs are transcribed from the same promoter and transcriptional unit as the GOI, allowing selection functionality to be achieved without the metabolic cost of producing separate resistance proteins.
2Productivity
If traditional antibiotic resistance markers are used for cell selection, then cell selection can be achieved, but selection efficiency decreases due to decoupling of marker production from GOI production
Solution Approach 1:
The selection marker function is merged with GOI expression by using non-coding RNAs transcribed from the same transcriptional unit. This ensures that marker production is reliably coupled to GOI production, as both are transcribed together from the same promoter and transcriptional start site, eliminating the decoupling problem of traditional separate marker expressions.
3Quantity of substance
If cell density is increased to improve product yield, then total product amount increases, but specific productivity per cell does not increase significantly
Solution Approach 1:
The patent changes the fundamental parameter of selection mechanism from protein-based antibiotic resistance to non-coding RNA-based transcriptional coupling. This parameter change enables the identification and selection of cells with high specific productivity, as the non-coding RNA expression directly reflects GOI transcriptional activity, allowing for more efficient selection of high-producing clones.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enhances GOI productivity by minimizing metabolic stress, reducing error rates in marker production, and increasing the efficiency of cell selection, leading to higher yields and reduced maintenance of non-productive cells.
Implementation Method 1
the non-coding RNA promotes or inhibits production of the selection protein
Data Source
AI summary
Described herein are methods and compositions for producing a gene of interest (GOI) which, in certain embodiments, can reduce the metabolic burden on cells and reduce decoupling of GOI production from marker production, as compared to prior art methods. The methods relate to positive selection and negative selection approaches to establishing high GOI-producing cell lines, e.g., CHO lines. In certain embodiments, the methods comprise transfecting a cell with (a) an oligonucleotide comprising a GOI and a non-coding RNA, and (b) an oligonucleotide encoding a selection protein; wherein the non-coding RNA promotes or inhibits production of the selection protein. The cell producing the GOI can be identified and/or selected as a result of or by detecting the absence or the presence of the selection protein.